气候变化领域集成服务门户(CCPortal): Bathymetric Influences on Antarctic Ice-Shelf Melt Rates

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DOI	10.1029/2020JC016370
	Bathymetric Influences on Antarctic Ice-Shelf Melt Rates
	Goldberg D.N.; Smith T.A.; Narayanan S.H.K.; Heimbach P.; Morlighem M.
发表日期	2020
ISSN	21699275
卷号	125 期号:11
英文摘要	Ocean bathymetry exerts a strong control on ice sheet-ocean interactions within Antarctic ice-shelf cavities, where it can limit the access of warm, dense water at depth to the underside of floating ice shelves. However, ocean bathymetry is challenging to measure within or close to ice-shelf cavities. It remains unclear how uncertainty in existing bathymetry datasets affect simulated sub-ice-shelf melt rates. Here we infer linear sensitivities of ice-shelf melt rates to bathymetric shape with grid-scale detail by means of the adjoint of an ocean general circulation model. Both idealized and realistic-geometry experiments of sub-ice-shelf cavities in West Antarctica reveal that bathymetry has a strong impact on melt in localized regions such as topographic obstacles to flow. Moreover, response of melt to bathymetric perturbation is found to be non-monotonic, with deepening leading to either increased or decreased melt depending on location. Our computational approach provides a comprehensive way of identifying regions, where refined knowledge of bathymetry is most impactful, and also where bathymetric errors have relatively little effect on modeled ice sheet-ocean interactions. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Adjoint, Bathymetry; Ice shelf; ice-ocean interaction; Ocean model
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186582
作者单位	School of Geosciences, University of Edinburgh, Edinburgh, United Kingdom; Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, TX, United States; Mathematics and Computer Science Division, Argonne National Laboratory, Lemont, IL, United States; Jackson School of Geosciences, The University of Texas at Austin, Austin, TX, United States; Institute for Geophysics, The University of Texas at Austin, Austin, TX, United States; Department of Earth System Science, University of California Irvine, Irvine, CA, United States
推荐引用方式 GB/T 7714	Goldberg D.N.,Smith T.A.,Narayanan S.H.K.,et al. Bathymetric Influences on Antarctic Ice-Shelf Melt Rates[J],2020,125(11).
APA	Goldberg D.N.,Smith T.A.,Narayanan S.H.K.,Heimbach P.,&Morlighem M..(2020).Bathymetric Influences on Antarctic Ice-Shelf Melt Rates.Journal of Geophysical Research: Oceans,125(11).
MLA	Goldberg D.N.,et al."Bathymetric Influences on Antarctic Ice-Shelf Melt Rates".Journal of Geophysical Research: Oceans 125.11(2020).